Abstract
The West Hewitt Penn Sand Unit, a waterflood in southern Oklahoma, has utilized progressing cavity pumps (PCP) since September 1988. Producing zone depth is approximately 2100′ with PCP producing rates of 200 to 1100 BPD per well. Through an evolution of PCP configurations and designs a 4+ year pump life can be expected, with only minor repairs. Adjustable rates at the surface, low capital costs, low repair costs and high electrical efficiency are the attractive characteristics of this artificial lift method. Improved identification of elastomer compatibility with reservoir fluids / conditions; improved prediction of stator-rotor fit over time; and reduction of top rod / drivehead breaks are the remaining challenges to improving PCP performance.
